# Osmosis Box vs Casty

The clearest difference is in-app purchases: Casty at none against Osmosis Box's 2. Casty also leads on update cadence (every 2 days vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Osmosis Box sells 2 in-app purchases, starting at $1.69 per month. Casty asks for nothing beyond the download.

Osmosis Box ships an update weekly, Casty every 2 days. The most recent releases landed on October 5, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Osmosis Box | Casty |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/casty/id6740439860/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | — | Free |
| Size | 240 MB | 23 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Guangde Pili Pala Technology Co., Ltd.](https://appshunter.io/developer/1764862893) | [Wai Yip Li](https://appshunter.io/developer/1789980681) |

## What reviewers say

### Osmosis Box

[App page](https://appshunter.io/ios/app/osmosis-box/id6739975159)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly membership | $1.69 | per month |
| Yearly membership | $12.99 | per year |


### Casty

[App page](https://appshunter.io/ios/app/casty/id6740439860)

Transform PDF documents into engaging podcasts with live transcripts and a built-in dictionary. Listen offline to educational content in Japanese or English after generation.

**Highlights:** Convert PDFs to podcasts, Live transcripts, Built-in dictionary, Offline listening, Japanese and English support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Osmosis Box free?

Osmosis Box is free to download, with in-app purchases available.

### Is Casty free?

Casty is free to download, with no in-app purchases.

### Do Osmosis Box or Casty have ads?

Neither Osmosis Box nor Casty shows ads.

### Which is updated more often, Osmosis Box or Casty?

Osmosis Box ships an update weekly, and Casty every 2 days. Most recently, Osmosis Box was updated on October 5, 2026 and Casty on October 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*